An exaggerated life-threatening reaction to a previously encountered antigen is called

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An exaggerated life-threatening reaction to a previously encountered antigen is called anaphylaxis. It is a systemic allergic reaction that can lead to shock and be life-threatening if not treated promptly. Antibodies are proteins produced by the immune system to fight off foreign invaders such as viruses and bacteria. Allergens are substances that trigger an allergic reaction. Autoimmune diseases occur when the body's immune system attacks its own healthy cells, tissues, and organs.

An Exaggerated Life-Threatening Reaction to a Previously Encountered Antigen Is